* {
	margin: 0;
	padding: 0;
}

.w {
	width: 1200px;
	margin: auto;
}

a {
	text-decoration: none;
}

li {
	list-style: none;
}

body {
	background-color: #f3f5f7;
}

/* 头部部分 */
.header {
	height: 42px;
	padding: 30px;

}

.logo {
	float: left;
	width: 198px;
	height: 42px;
}

.nav {
	float: left;
	height: 42px;
	margin-left: 40px;
}

.nav ul {
	float: left;
}

.nav ul li {
	float: left;
}

.nav ul li a {
	display: block;
	height: 42px;
	font-size: 18px;
	color: #000000;
	line-height: 42px;
	padding: 0 10px;
	margin-right: 30px;
}

.nav ul li a:hover {
	color: #99ccff;
	border-bottom: 2px solid #99ccff;
}

.search {
	float: left;
	width: 410px;
	height: 42px;
	margin-left: 90px;
	background-color: red;
}

.search input {
	float: left;
	width: 345px;
	height: 38px;
	border: 2px solid #99ccff;
	border-right: none;
	padding-left: 13px;
	color: #cccccc;
	font-size: 14px;
}

.search button {
	float: left;
	width: 50px;
	height: 42px;
	border: none;
	background-image: url(../images/btn.png);
}

.user {
	float: right;
	line-height: 42px;
	margin-right: 30px;
	font-size: 14px;
	color: #666;
}

.user img {
	border-radius: 50%;
	vertical-align: middle;
}

/* banner部分 */
.banner {
	height: 421px;
	background-color: #1c036c;
}

.banner .w {
	height: 421px;
	background: url(../images/banner2.png) no-repeat top center;
}

.subnav {
	float: left;
	width: 190px;
	height: 421px;
	background: rgba(0, 0, 0, 0.3);
	font-size: 14px;
}

.subnav ul {
	margin: 0 20px;
}

.subnav ul li {
	margin-top: 25px;
}

.subnav ul li a {
	color: #fff;
}

.subnav ul li a:hover {
	color: #00a4ff;
}

.subnav ul li a span {
	float: right;
}

.course {
	float: right;
	width: 230px;
	height: 300px;
	margin-top: 50px;
	background-color: white;
}

.course h3 {
	height: 50px;
	text-align: center;
	line-height: 50px;
	color: #fff;
	font-size: 18px;
	background-color: #9bceea;
}

.bd ul {
	margin: 10px 20px 0;
}

.bd ul li {
	padding: 12px 0;
	border-bottom: 1px solid gray;
}

.bd ul li h4 {
	font-size: 16px;
	color: #4e4e4e;
}

.bd ul li p {
	font-size: 12px;
	color: #a5a5a5;
}

.bd a {
	display: block;
	width: 188px;
	height: 40px;
	border: 1px solid #00a4ff;
	margin: 5px 20px 0;
	text-align: center;
	color: #00a4ff;
	line-height: 40px;
	font-weight: 700;
}

/* 精品推荐 */
.goods {
	height: 60px;
	background-color: white;
	margin-top: 8px;
	box-shadow: 0 2px 3px 3px rgba(0, 0, 0, 0.1);
}

.goods h3 {
	float: left;
	margin-left: 35px;
	line-height: 60px;
	font-size: 16px;
	color: #00a4ff;
}

.goods ul {
	margin-left: 30px;
	float: left;
}

.goods ul li {
	float: left;
	line-height: 60px;
}

.goods ul li a {
	color: #000000;
	padding: 0 35px;
	border-left: 1px solid #ccc;
}

.goods>a {
	float: right;
	margin-right: 20px;
	line-height: 60px;
	font-size: 14px;
	color: #00a4ff;
}

/* 核心内容区 */
.box {
	height: 600px;
	margin-top: 35px;
}

.box-top {
	height: 42px;
}

.box-top h3 {
	float: left;
	font-size: 20px;
	color: #333333;
}

.box-top a {
	float: right;
	margin-top: 10px;
	font-size: 12px;
	color: #999999;
}

.box-botton {
	height: 558px;
}

.box-botton ul {
	width: 1250px;
}

.box-botton ul li {
	position: relative;
	float: left;
	width: 230px;
	height: 270px;
	background-color: white;
	margin-right: 12.5px;
	margin-bottom: 10px;
}

.box-botton ul li > img {
	width: 100%;
}
.box-botton ul li em{
	position: absolute;
	top: 4px;
	right: -4px;
}
.box-botton ul li h4 {
	font-weight: 400;
	font-size: 14px;
	margin: 20px;
}

.box-botton ul li .info {
	font-size: 12px;
	margin: 20px;
	color: #ccc;
}

.box-botton ul li .info span {
	color: orange;
}

/* 编程入门部分和数据分析师部分 */
.box1 {
	height: 440px;
	margin-top: 30px;
}

.box1-top {
	height: 40px;
}
.box1-top h4{
	float: left;
	font-size: 20px;
	font-weight: 400;
	color: #333;
}
.box1-top ul{
	float: left;
	margin-left: 340px;
	line-height: 40px;
}
.box1-top ul li{
	float: left;
	margin-right: 75px;
}
.box1-top ul li .xianshi{
	color: #0099ff;
}
.box1-top ul li a{
	font-size: 16px;
	color: #999999;
}
.box1-top>a{
	float: right;
	font-size: 12px;
	color: #CCCCCC;
	margin-top: 10px;
}
.box1-left {
	float: left;
	width: 230px;
	height: 400px;
}

.box1-left img {
	width: 100%;
	height: 100%;
}

.box1-right {
	float: right;
	width: 955px;
	height: 400px;
	margin-left: 15px;
}

.box1-right-top {
	height: 100px;
	margin-bottom: 25px;
}

.box1-right-top img {
	width: 100%;
	height: 100%;
}

.box1-right-bottom {
	height: 275px;
}

.box1-right-bottom ul {
	width: 1000px;
}

.box1-right-bottom ul li {
	position: relative;
	float: left;
	width: 232px;
	height: 275px;
	background-color: white;
	margin-right: 9px;
}

.box1-right-bottom ul li > img {
	width: 100%;
}

.box1-right-bottom ul li h4 {
	margin: 20px;
	font-weight: 400;
	font-size: 14px;
}

.box1-right-bottom ul li .info {
	position: absolute;
	font-size: 12px;
	color: #ccc;
	margin: 20px;
	bottom: 0px;
}

.box1-right-bottom ul li .info span {
	color: orange;
}
/* 机器学习工程师部分和前端开发工程师部分 */
.box2{
	height: 310px;
	margin-top: 30px;
}
.box2-top {
	height: 40px;
}
.box2-top h4{
	float: left;
	font-size: 20px;
	font-weight: 400;
	color: #333;
}
.box2-top ul{
	float: left;
	margin-left: 340px;
	line-height: 40px;
}
.box2-top ul li{
	float: left;
	margin-right: 75px;
}
.box2-top ul li .xianshi{
	color: #0099ff;
}
.box2-top ul li a{
	font-size: 16px;
	color: #999999;
}
.box2-top>a{
	float: right;
	font-size: 12px;
	color: #CCCCCC;
	margin-top: 10px;
}
.box2-bottom{
	height: 270px;
}
.box2-bottom ul{
	width: 1250px;
}
.box2-bottom ul li{
	position: relative;
	float: left;
	width: 230px;
	height: 270px;
	background-color: white;
	margin-right: 12.5px;
}
.box2-bottom ul li > img{
	width: 100%;
}
.box2-bottom ul li h4 {
	margin: 20px;
	font-weight: 400;
	font-size: 14px;
}

.box2-bottom ul li .info {
	position: absolute;
	font-size: 12px;
	color: #ccc;
	margin: 20px;
	bottom: 0px;
}

.box2-bottom ul li .info span {
	color: orange;
}




/* footer部分 */
.footer {
	height: 420px;
	background-color: white;
	margin-top: 20px;
}

.footer .w {
	padding-top: 35px;
}

.copyright {
	float: left;
}

.copyright p {
	font-size: 12px;
	color: #666;
	margin: 20px 0 15px 0;
}

.copyright a {
	display: block;
	width: 118px;
	height: 33px;
	border: 1px solid #00a4ff;
	text-align: center;
	line-height: 33px;
	color: #00a4ff;
	font-size: 16px;
}

.links {
	float: right;
}

.links dl {
	float: left;
	margin-left: 100px;
}

.links dl dt {
	font-size: 16px;
	color: #333;
	margin-bottom: 5px;

}

.links dl dd a {
	color: #333;
	font-size: 12px;
}
